Function getImpliedNodeFormatForFile

test/fixtures/snapshot/typescript.js:116476–116491

* A function for determining if a given file is esm or cjs format, assuming modern node module resolution rules, as configured by the * `options` parameter. * * @param fileName The normalized absolute path to check the format of (it need not exist on disk) * @param [packageJsonIn

(fileName, packageJsonInfoCache, host, options)

     * @returns `undefined` if the path has no relevant implied format, `ModuleKind.ESNext` for esm format, and `ModuleKind.CommonJS` for cjs format
     */
    function getImpliedNodeFormatForFile(fileName, packageJsonInfoCache, host, options) {
        switch (ts.getEmitModuleResolutionKind(options)) {
            case ts.ModuleResolutionKind.Node16:
            case ts.ModuleResolutionKind.NodeNext:
                return ts.fileExtensionIsOneOf(fileName, [".d.mts" /* Extension.Dmts */, ".mts" /* Extension.Mts */, ".mjs" /* Extension.Mjs */]) ? ts.ModuleKind.ESNext :
                    ts.fileExtensionIsOneOf(fileName, [".d.cts" /* Extension.Dcts */, ".cts" /* Extension.Cts */, ".cjs" /* Extension.Cjs */]) ? ts.ModuleKind.CommonJS :
                        ts.fileExtensionIsOneOf(fileName, [".d.ts" /* Extension.Dts */, ".ts" /* Extension.Ts */, ".tsx" /* Extension.Tsx */, ".js" /* Extension.Js */, ".jsx" /* Extension.Jsx */]) ? lookupFromPackageJson() :
                            undefined; // other extensions, like `json` or `tsbuildinfo`, are set as `undefined` here but they should never be fed through the transformer pipeline
            default:
                return undefined;
        }
        function lookupFromPackageJson() {
            var scope = ts.getPackageScopeForPath(fileName, packageJsonInfoCache, host, options);
            return (scope === null || scope === void 0 ? void 0 : scope.packageJsonContent.type) === "module" ? ts.ModuleKind.ESNext : ts.ModuleKind.CommonJS;
        }
    }
    ts.getImpliedNodeFormatForFile = getImpliedNodeFormatForFile;
    /** @internal */
    ts.plainJSErrors = new ts.Set([